[Takket]

Let's say I attempt a mission with Commander Uhura.

She encounters some dilemma my Away Team cannot pass, but I use her special download to get Seductive Dance out of my Q's Tent.

And let's say... I forgot that Seductive Dance requires me to discard one of my events from play, and I do not have any events in play.

actions - step 1: initiation

Initiating an action may include any or all of the following, in this order:

declaring the use of a multi-function card (for example, you may discard a Space-Time Portal from the table for one of five possible results);

meeting conditions of rules and game text (e.g., battle affiliation restrictions; an open Alternate Universe Door to play an card; game text such as "plays at start of battle");

At this point I've failed the "meeting conditions of game text" part of the action initiation of using Seductive Dance.

I see things about actions becoming invalid AFTER initiation is complete, but what if I fail initiation?

Where does Seductive Dance go?

Is Uhura's used up for the game?

[Professor Scott]

Seductive Dance says:

Plays on table. Once each turn,...

So the is used, the card plays to table, and you are unable to initiate any of the actions.

It just sits there until you use it.