I was absolutely thinking of multi-Doctor specials. Granted, when more than one regeneration of the Doctor get together, they usually spend a lot of their time squabbling (Two and Three, love it!), whereas here, it was all love, mutual support, and light teasing. Tobey gently scolding Andrew for all the "negative self-talk" was so sweet, and while there was some initial confusion over who was Peter 1/2/3, they didn't really bicker at all over the order.
But between the multiple Spider-Men and the "coming together to correct past regrets" thing, I was especially reminded of "The Day of the