Silent Witness Pearl, 10.30pm Tonight we have the concluding part of the first episode of this gritty BBC crime series. Pathologist Sam Ryan (Amanda Burton, above) is now a university professor but has been called in to investigate the ditching of a helicopter on its way to a gas rig. The pilot (Matt Davis) appears to have had a heart attack just before the aircraft plunged to the ground. But after a series of blood tests - and the discovery of a needle puncture mark on the pilot's arm - Ryan begins to suspect foul play. With 75 commercial helicopters grounded, accident investigator Tony Newsome (Paul Chapman) wants and needs answers as swiftly as possible. When 10 more bodies are recovered from the North Sea, Ryan's skills and pathology team are required for the piecing together of the jigsaw of evidence. The fact that a new rotor bolt was fitted to the crash helicopter recently and that the files are not up-to-date raises more questions. Who supplied and fitted the parts and did the pilot and engineer know anything about this? Time to call in the people who may throw light to this mystery. Nigel Terry plays the chief executive of the helicopter company, Paul Copley is general manager Chris Tillson, Melanie Hill is Liz, wife of the pilot and Chris Walker is engineer Keith Connel. Roswell Pearl, 8.30pm A new girl called Tess Harding (Emilie de Ravin) appears on the scene and before you can say 'who?', alien hybrid Max Evans (Jason Behr, above with Shiri Appleby) finds himself 'strangely drawn' to her. So strange that in the middle of a biology class Max sees visions of himself passionately embracing Tess. Desperate to find some rational explanation behind his sudden wild imagination, Max consults fellow alien Michael Guerin (Brendan Fehr) but is only told that Sheriff Valenti (William Sadler) is close on the trail in finding out their extraterrestrial identity. In the meantime, will Tess come between Max and Liz Parker (Shiri Appleby)? Santana: Supernatural Live HBO, 9pm Carlos Santana (above with Mana) has been around for a long time but he is still as popular as ever. Typically characterised by his devotion to musical technique, his jazz-like penchant for lengthy, improvised, guitar solos placed him in a class above standard 70s rockers. His popularity has recently shot sky-high with his album Supernatural, which has him teamed up with many Top 40 musicians in assorted collaborations. The multi-Grammy-winning album sold more than 15 million copies worldwide. In a way, this new surge in popularity has been long overdue considering the length and depth of Santana's career. This HBO special is the full-length recording of a concert last April along with his band and special guests. Many songs are from Supernatural, featuring collaborations with Sarah McLachlan, Rob Thomas, Dave Matthews and Lauryn Hill. The camera work is creative, featuring large, sweeping, crane shots mixed with careful close-ups. Santana's guitar even has a small camera attached to the top, providing an extra close-up view of his fast fingerwork. Some of the numbers performed include Black Magic Woman, Gypsy Queen and Oye Como Va.