Potentially an intriguing premise, but an ultimately botched execution. Slapdash and confusing, I remember several scenes vividly, but couldn't explain the overarching plot for love nor money, possibly because there wasn't one. Attempts to introduce every previous Doctor as Eight travels back to meet them in a series of vignettes that ranged from fascinating to perplexing to downright tedious in a manner that I can only compare to CATS! (2019). I would accept it on AO3, but as the start of an official BBC-licensed series? Downright execrable.

Oh, Sam's here too. Hi, Sam. This really wasn't a good place for you to come in, Sam.