Ewan McGregor says “Trainspotting” remains a defining moment in his career.

In ET's exclusive sneak peek, Sherlock rattles off just what he's been up to since he, you know, undid his own death -- and unsurprisingly, he's been keeping busy with the P.I. Earlier this year, Elementary boss Rob Dohertyoffered a glimpse into what awaits fans in the series finale. You hate to have one good finale and one bad finale. "I hope anyone who enjoyed the original series finale will enjoy this one just as much." The Elementary series finale airs Thursday, Aug. 15 at 10 p.m. ET/PT on CBS.