Lancelot
Adventurer
For my money, the best module featuring the Big T is "The Apocalypse Stone", a TSR release in the dying days of 2nd Edition. The module is designed to be an end-piece to a campaign world, so it features all sorts of cataclysmic stuff. An exiled archdevil, some truly nasty anthropophagy, lethal high-level opponents, a death knight seeking redemption... the works.
To quote from a previous thread, some of the module is a bit bland... but there are some really memorable scenes in it as well. The Big T is not the focus of the adventure, though... he's more like a side-trek in Chapter 3. The PCs are warned that a Horned Beast is tearing up villages, and an NPC knight (from memory) implores them to help defeat it. They get the choice to investigate... and might be a little surprised to find that it's not just "any" Horned Beast... it's THE Horned Beast. Just another of several such events which impress upon the party that these are the End Times...
To quote from a previous thread, some of the module is a bit bland... but there are some really memorable scenes in it as well. The Big T is not the focus of the adventure, though... he's more like a side-trek in Chapter 3. The PCs are warned that a Horned Beast is tearing up villages, and an NPC knight (from memory) implores them to help defeat it. They get the choice to investigate... and might be a little surprised to find that it's not just "any" Horned Beast... it's THE Horned Beast. Just another of several such events which impress upon the party that these are the End Times...